A) catalytic agents
B) phytohormones
C) enzymes
D) compost
Correct Answer: B
Solution :
The term hormone was first used by Starling (1906). The growth and development in plants are controlled by a special class of chemical substances called hormones. This is also called as phytohormones. The term phytohormone was given by Thimann (1948). It can be defined by Thimann as "an organic substance produced naturally in plants controlling growth and other functions at a site remote from its place of production and active in minute amounts".
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